One of Kentucky's top elected Democrats said Monday he is concerned the struggling party will not be able to field a viable candidate to challenge U.S. Sen. Rand Paul in November.

U.S. Rep. John Yarmuth of Louisville said he has been working with the Democratic Senatorial Campaign Committee to recruit potential candidates. He said some viable candidates are thinking about running for the seat but would not say they were likely to run. He said Democrats would have to nominate someone who is already well known to voters and has the ability to raise lots of money.

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Former Democratic state Auditor Adam Edelen was the most likely Democrat to challenge Paul. But Edelen lost his re-election campaign to Republican Mike Harmon in November.